[Bug tree-optimization/45120] New: [4.6 Regression] -fipa-pta causes FAIL: gcc.c-torture/execute/pta-field-2.c execution

[Bug tree-optimization/45120] New: [4.6 Regression] -fipa-pta causes FAIL: gcc.c-torture/execute/pta-field-2.c execution

[zsojka at seznam dot cz]

With -fipa-pta in flags, pta-field-2.c FAILs:

FAIL: gcc.c-torture/execute/pta-field-2.c execution,  -O2 
FAIL: gcc.c-torture/execute/pta-field-2.c execution,  -O3 -fomit-frame-pointer 
FAIL: gcc.c-torture/execute/pta-field-2.c execution,  -O3 -g 
FAIL: gcc.c-torture/execute/pta-field-2.c execution,  -Os 
FAIL: gcc.c-torture/execute/pta-field-2.c execution,  -O2 -flto 

Command line:
$ gcc -O2 -fipa-pta pta-field-2.i
$ ./a.out
Aborted

The code might be undefined, but even -fno-strict-aliasing doesn't help:
$ gcc -O2 -fipa-pta pta-field-2.i -fno-strict-aliasing
$ ./a.out
Aborted

Tested revisions:
r162653 - fail
r161659 - fail
r161170 - OK


-- 
           Summary: [4.6 Regression] -fipa-pta causes FAIL: gcc.c-
                    torture/execute/pta-field-2.c execution
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: zsojka at seznam dot cz
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45120

[Bug tree-optimization/45120] [4.6 Regression] -fipa-pta causes FAIL: gcc.c-torture/execute/pta-field-2.c execution

[rguenth at gcc dot gnu dot org]

------- Comment #1 from rguenth at gcc dot gnu dot org  2010-07-29 10:01 -------
Confirmed, mine.

We generate wrong constraints for

bar (int * * x)
{
  int * D.2737;

<bb 2>:
  D.2737_3 = MEM[(struct Foo *)x_1(D) + -8B].p;
  *D.2737_3 = 0;
  return;

}

Generating constraints for bar (bar)

bar.arg0 = &NONLOCAL
D.2737_3 = *bar.arg0
bar.use = bar.arg0
bar.clobber = D.2737_3

I have a patch.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |rguenth at gcc dot gnu dot
                   |dot org                     |org
             Status|UNCONFIRMED                 |ASSIGNED
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2010-07-29 10:01:51
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45120

[Bug tree-optimization/45120] [4.6 Regression] -fipa-pta causes FAIL: gcc.c-torture/execute/pta-field-2.c execution

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2010-07-29 12:30 -------
Subject: Bug 45120

Author: rguenth
Date: Thu Jul 29 12:30:09 2010
New Revision: 162676

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=162676
Log:
2010-07-29  Richard Guenther  <rguenther@suse.de>

        PR tree-optimization/45120
        * tree-ssa-structalias.c (get_constraint_for_component_ref):
        Handle offset in DEREFs properly.
        (get_constraint_for_1): Handle MEM_REF offset properly.

        * gcc.dg/ipa/ipa-pta-15.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/ipa/ipa-pta-15.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-structalias.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45120

[Bug tree-optimization/45120] [4.6 Regression] -fipa-pta causes FAIL: gcc.c-torture/execute/pta-field-2.c execution

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2010-07-29 12:31 -------
Fixed.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |4.6.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45120